Electrical fuse



Jan. 24, 1928. v 1,657,207 A. FERNANDEZ ELECIRI CAL FUSE Filed Sept. 4. 1926 yum-W Patented Jan. 24, 1923,-

UNITED STATES aueusrm mnennnz, on NEW YORK, n. Y., nssreuoa on own-ma r0 r":

PATENT OFFICE.

"ES M.

CONLON, OF NEW YORK, N. Y.

nnnornrc'sr. ruse.

Application flied September 4, 1926. Serial No. 133,867.

This invention-relates to fuses used in electrical circuits and more particularly to what may be termed socket fuses; and the ob ect of the invention is to provide a fuse mounted in a suitable holder, having the proper terminal contacts, to form an in dependent unit adapted to enter an ordinary socket just above alamp or plug, and as the latter 1S screwed up into position, form an electrical connection with the fuse element in circuit, means being provided to position the holder on the plug to prevent it from slipping oil? and thereby facilitate its use. Other ob ects will appear throughout the following detailed description.

The use of a device of this character has many advantages, particularly in manufacturing plants where numerous machines are being operated from a common sourcepf ower comin over one line or circuit which is protected y only the usual fuse mounted in a fuse box. Should thishfuse blow, all the machines on the circuit must of necessity come to a stop until such timeas the trouble may be located and a new fuse reinstalled.

Meanwhile thework is held up on all of the machines, but with my improvedfuse in use in every socket any trouble arising can be immediately localized and onlythe disabled machine is made idle until such time as the ditficulty may be corrected and the blown fuse replaced.

My invention is fully set forth in deta l in the following specification and drawing; forming a part thereof in which latter have illustrated a preferred embodiment of my invention.

Referring to such drawings,

Figure 1 is a vertical section of my 1m-. proved fuse shown operatively pos1t1oned intermediate the socket terminals and an electrical element to be inserted in the sockat, the two latter being indicated in dotted lines.

Figure 2 is a top plan view of the fuse.

Figure 3 is a bottom plan view of same.

Figure 4 is a sectional view taken on the line H 'of Figure 2.

Figures 5 and 6 are top and bottom plan views respectively of the fuse holder.

Figure 7 is a plan view of one of the insulators or mica disks used in the-fuse.

Figure 8 is a plan view of the index card.

Figure 9 is a perspective view of one of the contacts.

Figure 10 is a sectional view of a modified form of the invention.

The holder 10 comprising a casing, is preferably made of porcelain, but other suitable insulating material may be used. It is cylindrical and as shown in Figure 1 in section, resembles a letter H, having an upper and lower extending flange 11 and 12 respectively. These flanges constitute positioning means so that the fuse may be placed upon a plug or lamp base indicated at 13 in dotted lines, the boss 14 entering the recess within the annular walls of the flange to effectively prevent the fuse from slipping ofi of the plug prior to screwing the latter into the socket.

vWhile the lower flange is shown somewhat longer than the upper one, .both could be made of equal length if desired and the parts could then be assembled in an opposite order within the holder.

The flanges serve also as a protective housmg and provide a convenient form of unit for packing and shipping purposes. tact pieces 15 and 16 are adapted to fit within depressions .10 and 10 in the bridge 17 of the holder, bosses 18 and 19 passing through openings in the contact. pieces. A mica disk 20, about thick, is mounted over the contact 15, the former being provided with an aperture 21 so that the terminal 15 of the contact can be first passed through the aperture after which it is given a right angle band as shown. A mica disk 22, about thick, is placed over the contact 16 and has a similar aperture 23, and

over this is placed a paper disk 24 com rising an index card and apertured at 25. en another'mica disk 26 is positioned over the disk 24 and has an aperture 27. Through these apertures the terminal 16' of the contact 16 is passed and bent over in a manner similar to the other contact.

Rivets28 are then passed through holes 29 in the several disks as well as holes 30 in the'bridge 17 and serve efiectively to bind the parts together in assembled relation. The index card may have suitable legends printed 'on its lower surface, such for example as amperes and volts, thereby designating the character of the fuse, and which will be clearly visible through the mica disk over it. An aperture 31 in the bridge of the holder permits the fuse wire 32 to be connected to the two contacts to which it is soldered. The index card is provided with Concan

a peep hole 33 to visually detect the condition of the fuse wire 32.

In Figure 9 one of the contacts is show with its terminal prior to bending so that the several disks can be readil slipped over it, and when in proper assembled position the terminal can be pressed'down and the rivets put in with one operation. Obviously one of the contacts will be soldered'to one end of the fuse wire before assembly subsequent-- ly followed by the soldering of the other end after assembly.

In the modification shown in Figure 10 no rivets are used, the inner walls of the flan as being undercut at 34 so that the disks e snapped into place and thereby so retained. I

As various modifications within the sec e of the appended claims may be made wit out departing from the spirit of my invention, such changes in details of construction which are merely mattersof form of design are to be considered within the scope of the I claim:

1. A. socket fuse adapted to be interposed between the contact terminals of a socket and an electrical element inserted therein comprising a holder, a fuse wire operatively mounted in said holder, the end of said V holder being recessed to receive one of said contact terminals and to provide supportin means circumferentially disposed aroun said recessitn thereby sustain said holder on said electrical element prior to the aforesaid assembled relation.

A socket comprising a holder of menace wall, to thereby form recesses above and beneath same, contacts mounted within said recesses in locking engagement with said wall and on opposite sides thereof, a fuse .wire extending through said wall and con nected to said contacts, and heat insulating means extending over the ends ofsaid fuse wire.

' 4. A socket fuse comprising a holder of tubular configuration, and provided witha substantially centrally disposed transverse ac wall, to'thereby form recesses above and beneath same, contacts mounted within said recesses on opposlte sides of said wall, a

fuse wire extending through said Well and connected to said contacts,end heat insulating means extendin over the ends of said v fuse wire, and inclu ing an index card provided with an inspection aperture.

5. A socket fuse comprising a holder, con tacts mounted at opposite ends thereof, a fuse wire connecting said contacts, heatinsulating means extending over the ends of said tuse wire, and including an index card.

aoensrnr FERNANDEZ. 

